摘要
根据层状四水硫酸锆和Hβ沸石各自的催化性能和结构特点 ,设计并制备得到Hβ负载锆 (Zr Hβ)催化剂。以异丙苯歧化反应为目标体系 ,研究了Zr Hβ的催化性能。利用吡啶吸附程序升温脱附和低温氮吸附等方法研究了Zr Hβ和Hβ的表面酸性和孔结构 ,与反应性能进行关联。结果表明 ,Zr Hβ较Hβ弱酸强度更弱、强酸强度更强 ,导致其歧化反应活性较Hβ大大提高 ,歧化选择性较Hβ略有提高 ,但其初始歧化选择性较Hβ降低 ;Zr Hβ和Hβ的最可几孔径基本一致 ,因而Zr Hβ催化异丙苯歧化反应产物中间位 对位
A series of Hβ supported Zr catalysts (Zr/Hβ) have been designed and prepared according to the catalytic performances and structure of layered zirconium sulfate tetrahydrate and Hβ zeolite, respectively The catalytic performances of Zr/Hβ have been studied using cumene disproportionation as probe reaction Surface acidities and pore structure of Zr/Hβ and Hβ have been investigated using pyridine adsorption TPD and nitrogen adsorption desorption isotherm The results show that the weak acidities of Zr/Hβ are weaker than that of Hβ and the strong acidities of Zr/Hβ are stronger than that of Hβ, leading to the activities of Zr/Hβ increased greatly compared to that of Hβ, and the disproportionation selectivities of Zr/Hβ increased slightly compared to that of Hβ, but the initial disproportionation selectivities of Zr/Hβ decreased compared to that of Hβ The pore sizes of Zr/Hβ and Hβ are very similar,so molar ratio of m /p diisopropylbenzene in cumene disproportionation products over Zr/Hβ is almost consisted with that over Hβ
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2002年第4期358-362,共5页
Journal of Fuel Chemistry and Technology
